pump for pressure control

[tjagiello]

Hi guys,

I've got a rotary pump which has a built in bypass valve and is normally used in beverage machines. You can set the bypass valve to lower the maximum pressure to pretty much whatever value you want, but it still pumps a lot of water, somewhere in the range of 170L/h. It is powered by a small 250W motor with a start capacitor (single phase obviously).

Now I'd like to control the pressure fully, but without touching the bypass valve and while the pump is working. The range that interests me is 1-9bar with precise control (most likely digital). Is there any pump on the market that would be suitable for this?

Regards,
Tom

 

[BigInch]

Finally a perfect application for VFD???

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[ScottyUK]

Someone call a doctor, BigInch is sick...

Slightly more seriously a capacitor start motor is not compatible with a VFD. If you do want to go the VFD route you would have much better options if you have a three phase motor. Of course, changing the motor might make the economics of using the VFD fall apart...


----------------------------------

If we learn from our mistakes I'm getting a great education!

 

[Artisi]

Do you wish to maintain the same flow at the different pressures?

 

[tjagiello]

Hi guys,

no, the same flow is not necessary.

Regards,
Tom

 

[BigInch]

Ya. I always get sick thinking of VFDs.

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[Artisi]

The original question was;

"Is there any pump on the market that would be suitable for this?"

Probably yes, have you contacted any manufacturers / sellers of this pump type - always a good place to start.

 

[BigInch]

I'll be more clear. Keep the same pump; add a VFD.

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[ScottyUK]

Just as clearly: that motor is not compatible with a VFD. Keep the pump, change the motor.


----------------------------------

If we learn from our mistakes I'm getting a great education!

 

[BigInch]

I'll take your word for that.
So, keep the pump, change the motor and add a VFD.

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[itsmoked]

You would actually want a small BLDC motor with a drive to control it. This would not be a conventional VFD..

Keith Cress
kcress -

http://www.flaminsystems.com